NIKE Zoom Rival Sprint 6 Running Spikes One piece mesh Upper - Reduces seams for breathability and comfort. Seamless Overlay - Provide structured support without adding weight. Internal Midfoot arch bandage - Helps lock down the foot for a snug, secure fit and optimal power transfer on the track. Compression molded phylon Midsole - Delivers a smooth, responsive ride from heel to forefoot. Molded Medial Arch - Provides additional support in the midfoot for a variety of distance races.